JP2008144516A - Horizontal support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal support device which is made compact by simplifying the installation structure of an upper structure. <P>SOLUTION: This horizontal support device has a laminated rubber body 2 supporting a horizontal load of the upper structure 1 by causing shearing deformation in the horizontal direction. A recessed part 6 is formed on an upper surface of an upper steel plate 21 of the laminated rubber body 2. A brake plate 12 is fixed to an upper shoe 13, and a lower part is formed larger in the length in the horizontal direction than an upper part, and a step part 12C is also formed between the lower part and the upper part. A flange plate 14 is formed on the outer peripheral edge of the recessed part 6 of the upper steel plate 21, and has rail joint openings g1 to g4 (1) between a key plate 12 and the upper steel plate 21, (2) between the flange plate 14 and the upper shoe 13, (3) between an outer peripheral surface of the key plate 12, the recessed part 6 of the upper steel plate 21 and respective inner peripheral surfaces of the flange plate 14 and (4) between a step part upper surface of the key plate 12 and the flange plate 14 engaging with this upper surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a horizontal support device for supporting a load in a horizontal direction, among so-called function-separated type support devices that support structures such as bridges, overpasses, building structures, and machines.

  Conventionally, a support device is arranged between an upper structure such as a bridge and a lower structure such as a pier, and the force acting from the upper structure is transmitted to the lower structure, so that the deflection due to the loading of the load on the upper structure. Absorbing twist deformation.

  The load transmission function includes a vertical force support function and a horizontal force support function. Many conventional bridge support devices have integrated functions that integrate both functions. The function-integrated bearings have the advantage that the fulcrum structure is simple in order to consolidate each function, but the bearing part becomes larger due to the balance of each function, and the bearing part is locally damaged or partially malfunctions. When this occurs, there is a concern that not only one function but also the other function greatly affects the other function.

  For this reason, recently, the vertical bearing device that supports the vertical load of the upper structure and the elastic body shear-deforms horizontally without supporting the vertical load of the upper structure. A function-separated type support device including a horizontal support device that supports a load has been proposed (Patent Document 1).

  As shown in FIG. 8, the horizontal bearing device disclosed in Patent Document 1 is a rectangular flange plate 31 (fixed to the upper surface of the lower structure 30 and forming a gap C1 between the upper structure and the upper structure. An elastic body 32 having an upper steel plate), and can be engaged with a peripheral surface of the flange plate 31 that is fixed to the lower surface of the upper structure and extends along the bridge axis direction and the direction perpendicular to the bridge axis. And a side block 33 that engages with each other. An engaging piece 34 is provided at the lower part of the side block 33. The elastic body 32 is formed by alternately laminating steel plates and rubber layers between the flange plate 31 and a lower steel plate (not shown), and simultaneously molding them by vulcanization adhesion.

Japanese Patent No. 3634288

  The horizontal support device supports the horizontal load by elastic deformation of the elastic body 32, and even if rotation occurs in the upper structure, the horizontal support device can allow the rotation by the above-described gap, and also with respect to the lifting force. The above-described engagement piece 34 engages with the flange plate 31, whereby the upper lifting force can be transmitted between the upper and lower structures via the elastic body 32, and the upper structure can be prevented from falling. .

  However, since the elastic body 32 has a large flange plate 31 that protrudes from the main body of the elastic body, and the side block 33 is attached to the lower surface of the upper flange 35 so as to hold the flange plate 31, the upper structure There is a problem that the mounting area of the object becomes large and the apparatus becomes large.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a horizontal bearing device that simplifies the mounting structure of the superstructure and makes the device compact.

A horizontal bearing device of the present invention for solving the above-described problem includes a laminated rubber body that supports a horizontal load of the upper structure by being shear-deformed in a horizontal direction without supporting a vertical load of the upper structure. The laminated rubber body is formed by alternately laminating intermediate steel plates and rubber layers between an upper steel plate and a lower steel plate, and integrally forming the key plate on the upper surface of the upper steel plate. The key plate is fixed to an upper collar fixed to the lower surface of the upper structure, the lower portion is longer in the horizontal direction than the upper portion, and A step portion is formed between the upper plate, and an engaging portion that engages with the step portion of the key plate is formed on an outer peripheral edge of the concave portion of the upper steel plate. (1) The key plate And (2) the engagement portion and the front (3) between the outer peripheral surface of the key plate and the inner peripheral surfaces of the recess and the engaging portion of the upper steel plate, and (4) the upper surface of the stepped portion of the key plate and the upper plate. It is characterized in that there is a free space between the mating engaging portions.
Examples of the engaging portion include a flange plate having an inverted L-shaped cross section. The flange plate may have a frame shape having a through-hole through which an upper portion of the key plate passes in a central portion.

  The horizontal support device of the present invention has a structure in which the engaging portion provided on the outer peripheral edge of the concave portion of the upper steel plate is engaged with the stepped portion of the key plate, so that it is outside the laminated rubber body as in the prior art. There is no need for an overhanging flange plate, and therefore no need for side blocks that are engaged so as to hold the flange plate. Therefore, there is an effect that the apparatus becomes compact and the workability is improved. Further, since the key plate and the engaging portion are inside the horizontal support device and are not exposed to the outside, the engaging portion is not damaged by an external force (such as an impact).

  Hereinafter, a horizontal support device according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken front view schematically showing a horizontal bearing device according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view thereof.

  The horizontal bearing device shown in FIG. 1 is installed in a non-loaded state with respect to the vertical load of the upper structure 1 and has a quadrangular columnar laminated rubber body 2. The laminated rubber body 2 is formed by alternately laminating a plurality of thin intermediate steel plates 23 and a rubber layer 24 between a thick upper steel plate 21 and a lower steel plate 22 and integrally forming them by vulcanization molding.

  In FIG. 1, reference numeral 4 indicates a lower rod, which is fixed to the lower steel plate 22 by the fixing bolt 3 and placed on the base plate 5. The base plate 5 has anchor bolts 8 embedded in the pier 7.

  On the other hand, a recess 6 is formed on the upper surface of the central portion of the upper steel plate 21 of the laminated rubber body 2. The lower end of the key plate 12 is accommodated in the recess 6. The key plate 12 is formed of a columnar body having a hat-shaped cross section (for example, a prism), and as shown in FIG. 2, the lower portion 12a is longer in the horizontal direction than the upper portion 12b, and between the lower portion and the upper portion. A step portion 12c is formed.

  An inverted L-shaped flange plate 14 (engagement portion) is disposed on the outer peripheral edge of the recess 6 in the upper steel plate 21. The flange plate 14 is fixed on the outer peripheral edge of the recess 6 by bolts 18. Then, a protrusion 14 a that is located at the upper end of the inverted L-shaped flange plate 14 and protrudes toward the inner peripheral side engages with a step 12 c of the key plate 12.

  FIG. 3 is a plan view showing the inverted L-shaped flange plate 14, which is configured in a frame shape having a through hole 19 through which the upper portion of the key plate 12 passes at the center.

  Further, the upper end of the key plate 12 is accommodated in a recess 15 formed on the lower surface of the upper collar 13, and is fixed to the upper collar 13 with a fixing bolt 17. The upper flange 13 is disposed on the lower surface of the sole plate 10, and the fixing bolt 11 inserted through the girder 9 of the upper structure 1 and the bolt insertion holes of the sole plate 10 is screwed into the upper flange 13, whereby the upper structure 1. It is fixed to the lower surface of the.

  In addition, the lower bar 4 and the lower steel plate 22 are respectively formed with recesses, and the shear key 16 is accommodated in a gap formed by facing the recesses (FIG. 1). As the shear key 16, a column-shaped (for example, a cylinder, a prism, etc.) frame is usually used.

In providing the key plate 12 and the inverted L-shaped flange plate 14, as shown in FIG. 2, the following gaps g1, g2, g3, and g4 are provided.
(1) Between the key plate 12 and the upper steel plate 21: g1
(2) Between flange plate 14 and upper flange 13: g2
(3) Between the outer peripheral surface of the key plate 14 and the inner peripheral surfaces of the recess 6 of the upper steel plate 21 and the flange plate 14: g3
(4) Between the upper surface of the step 12C of the key plate 12 and the flange plate 14 engaged therewith: g4

  Further, by providing the key plate 12, a gap is formed between the upper steel plate 21 and the upper collar 13. For this reason, dust or the like may enter the gaps g1 to g4 through this gap and clog the gaps. If dust or the like is clogged in the gaps g1 to g4, the functions of the gaps g1 to g4 described later are impaired, and there is a risk of serious damage to the bridge due to an earthquake or the like. Therefore, in order to prevent this, the elastic layer 20 is filled in the gap over the entire outer periphery of the flange plate 14. The elastic layer 20 is made of, for example, chloroprene rubber or a foam thereof. By providing such an elastic layer 20 on the entire circumference, it is possible to prevent dust and the like from entering the gaps g1 to g4, and the performance as a horizontal support is stabilized. Furthermore, since the elastic layer 20 can prevent water from entering the bearing body, there is an advantage that the corrosion resistance is improved.

  In the horizontal bearing device configured in this way, when the girder 9 receives a horizontal load in the direction of the bridge axis (indicated by an arrow in FIG. 1) or perpendicular to the bridge axis due to expansion or contraction due to temperature change or an earthquake, the arrow in FIG. The horizontal force shown is transmitted from the upper collar 13 to the key plate 14, and further transmitted to the laminated rubber body 2 through the recess 6 of the upper steel plate 21, and the laminated rubber body 2 is sheared and responds to a horizontal load.

  Further, when a vertical upward load (uplift force) acts on the upper structure 1 due to an earthquake or the like (indicated by an arrow in FIG. 5), the uplift force is applied from the upper rod 13 to the fixing bolt 17, the key plate 14, and the flange plate. 14 is transmitted to the laminated rubber body 2 through the bolt 18 and the upper structure 1 can be prevented from dropping.

  Further, when the upper structure 1 is rotated by a live load (indicated by an arrow in FIG. 6), since the gaps g1, g2, g3, and g4 exist around the key plate 14, the vertical load of the upper structure 1 The rotation of the upper structure can be allowed without imparting to the laminated rubber body 2. In order to prevent rotation, it is appropriate that the gaps g1, g2, g3, and g4 are about 3 to 20 mm.

Next, for the horizontal bearing device of the present invention, the relationship between the horizontal load and the shear strain when subjected to a horizontal load as shown in FIG. 4 was examined. The test was performed with a 5MN biaxial testing machine (vertical loading: + 5MN, horizontal loading: + 2MN, -1.5MN, horizontal displacement: ± 500 mm) manufactured by Shimadzu Corporation. The result is shown in FIG.
FIG. 7 shows that the horizontal bearing device of the present invention is excellent in responsiveness to horizontal loads.

  In the horizontal support device used for the test, the laminated rubber body 2 has a square plane with a side of 400 mm, and has a laminated structure of 6 layers with a rubber thickness of 9 mm per layer.

  As described above, in the present invention, the concave portion 6 is formed on the upper surface of the upper steel plate 21 of the laminated rubber body 2, the lower end portion of the key plate 14 is accommodated in the concave portion 6, and the key plate 14 is fixed to the upper collar 13. Since the flange plate 14 is attached to the outer peripheral edge of the concave portion 6 of the upper steel plate 21 and engaged with the key plate 14, there is nothing that protrudes greatly outside the laminated rubber body 2 having the upper steel plate 21. The device itself becomes compact.

  The present invention is not limited to the above-described embodiment, and various improvements and changes can be made. For example, as shown in FIG. 3, in the above embodiment, the flange plate 14 is configured in a frame shape, but the flange plate is arranged and fixed on each of the four sides of the key plate 14, even if it is not in a frame shape. There may be.

It is a partially broken front view which shows the horizontal bearing apparatus concerning one Embodiment of this invention. It is a partial expanded sectional view of FIG. (A) is a top view which shows the flange plate whose cross section concerning one Embodiment of this invention is a reverse L shape, (b) is the XX sectional drawing. It is a partial expanded sectional view which shows the horizontal force transmission effect | action in one Embodiment of this invention. It is a partial expanded sectional view which shows the uplifting force transmission effect | action in one Embodiment of this invention. It is a partial expanded sectional view which shows the rotational displacement follow-up action in one Embodiment of this invention. It is a graph which shows the relationship between the horizontal load at the time of receiving a horizontal load, and a shearing strain about the horizontal bearing apparatus of this invention. It is a front view which shows the conventional horizontal bearing apparatus.

Explanation of symbols

  1: Superstructure, 2: Laminated rubber body, 4: Lower arm, 5: Base plate, 7: Pier, 9: Girder, 10: Sole plate, 11: Fixing bolt, 12: Key plate, 13: Upper arm, 14 : Flange plate (engagement part), 15: recess, 16: shear key, 17: fixing bolt, 19: through hole, 20: elastic layer, 21: upper steel plate, 22: lower steel plate, 23: intermediate steel plate, 24: Rubber layer, g1, g2, g3, g4: idle

Claims (4)

Without supporting the vertical load of the upper structure, a horizontal bearing device comprising a laminated rubber body that supports the horizontal load of the upper structure by shear deformation in the horizontal direction,
The laminated rubber body is formed by integrally laminating intermediate steel plates and rubber layers alternately between an upper steel plate and a lower steel plate,
On the upper surface of the upper steel plate, a recess for accommodating the lower end of the key plate is formed,
The key plate is fixed to an upper collar fixed to the lower surface of the upper structure, the lower part is longer in the horizontal direction than the upper part, and a step is formed between the lower part and the upper part.
An engagement portion that engages with a step portion of the key plate is formed on the outer peripheral edge of the concave portion of the upper steel plate,
(1) Between the key plate and the upper steel plate, (2) Between the engaging portion and the upper collar, (3) The outer peripheral surface of the key plate, the concave portion of the upper steel plate, and the engaging portion And (4) a horizontal bearing device characterized by having a gap between the upper surface of the stepped portion of the key plate and the engaging portion engaged therewith.   The horizontal bearing device according to claim 1, wherein the engaging portion is a flange plate having an inverted L-shaped cross section.   The horizontal bearing device according to claim 2, wherein the flange plate has a frame shape having a through hole through which an upper portion of the key plate passes in a central portion.   The elastic layer is filled in the gap on the outer peripheral side of the engagement portion over the entire circumference so as to close the gap between the upper steel plate and the upper collar formed by the key plate. The horizontal bearing device described in Crab.

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